The problem exist only with a pdf. I can't publish it, the content is reserved. I have many other pdf, with protections or with Tagged PDF or Fast Web View enabled, but I haven't problem to upload.These are some informations of pdf file:

I have the same problem dude, temporarily i upload the PDF files via alfresco in the shared folder but then I cannot see the preview correctly. I think may be it's something wrong with the multi-uploader. I wish for future realeases the y include a simple uploader for this cases. If you know something else about this pls let me know.